Meta, para and meta, ortho double exo nucleophilic additions of trimethylsilylester enolates derived from saturated and unsaturated carboxylic acids to tricarbonylchromium complexes of aryl ethers: dearomatizing cyclization to lactones
作者:Henri Rudler、Virginie Comte、Eva Garrier、Moncef Bellassoued、Evelyne Chelain、Jacqueline Vaissermann
DOI:10.1016/s0022-328x(00)00848-2
日期:2001.3
Potassium enolates derived from saturated and unsaturated bis(trimethylsilyl) ketene acetals react with tricarbonylchromium complexes of anisole and diphenylether to give, in addition to α-arylcarboxylic acids, the mono adducts, lactones, arising from a double exo nucleophilic addition. The latter were not observed in the case of benzenetricarbonylchromium. The intermediate dienol ethers could be isolated
衍生自饱和和不饱和双(三甲基甲硅烷基)乙烯酮缩醛的烯醇钾与苯甲醚和二苯醚的三羰基铬配合物反应,除了α-芳基羧酸外,还可以通过双核外加亲核加成反应生成单加合物,内酯。在苯三羰基铬的情况下未观察到后者。可以分离出中间二烯醇醚,并通过X射线晶体学对其进行充分表征。已经确定并讨论了取代基的性质对酮缩醛的影响,氧化剂的性质以及酯烯醇盐的性质对反应过程的影响。